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===========================
Host Maintenance Strategy
===========================
Synopsis
--------
**display name**: ``Host Maintenance Strategy``
**goal**: ``cluster_maintaining``
.. watcher-term:: watcher.decision_engine.strategy.strategies.host_maintenance.HostMaintenance
Requirements
------------
None.
Metrics
*******
None
Cluster data model
******************
Default Watcher's Compute cluster data model:
.. watcher-term:: watcher.decision_engine.model.collector.nova.NovaClusterDataModelCollector
Actions
*******
Default Watcher's actions:
.. list-table::
:widths: 30 30
:header-rows: 1
* - action
- description
* - ``migration``
- .. watcher-term:: watcher.applier.actions.migration.Migrate
* - ``change_nova_service_state``
- .. watcher-term:: watcher.applier.actions.change_nova_service_state.ChangeNovaServiceState
Planner
*******
Default Watcher's planner:
.. watcher-term:: watcher.decision_engine.planner.weight.WeightPlanner
Configuration
-------------
Strategy parameters are:
==================== ====== ====================================
parameter type default Value description
==================== ====== ====================================
``maintenance_node`` String The name of the compute node which
need maintenance. Required.
``backup_node`` String The name of the compute node which
will backup the maintenance node.
Optional.
==================== ====== ====================================
Efficacy Indicator
------------------
None
Algorithm
---------
For more information on the Host Maintenance Strategy please refer
to: https://specs.openstack.org/openstack/watcher-specs/specs/queens/approved/cluster-maintenance-strategy.html
How to use it ?
---------------
.. code-block:: shell
$ openstack optimize audit create \
-g cluster_maintaining -s host_maintenance \
-p maintenance_node=compute01 \
-p backup_node=compute02 \
--auto-trigger
External Links
--------------
None.
|
